Vertex-neighbor-scattering number of graphs.

Disclosed are colored polyester compositions containing copolymerized anthraquinone dyes as colorants, which compositions may be used, for example, for food packaging and to mold colored beverage bottles. The copolymerized dyes are thermally stable at the processing temperatures, and are colorfast and nonextractable. The useful dyes have the general formula: wherein either or both of rings A and B may contain in any position thereon one or two groups of the formula R and R3 each is hydrogen, lower alkyl or lower hydroxyalkyl; R1, R2, R4 and R5 each is hydrogen or 1-3 substituents such as lower alkyl, lower alkoxy, phenyl, Cl, Br, or the like; X is -S- or -NH-; n is 1 or 2; m is 0, 1, or 2.